ايه المشكلة فى الكود ده ؟

<?php

$file = "http://4up.yaaaaah.com/file/moh/pdf/1508213994.pdf";

header("Content-Description: File Transfer");

header("Content-Type: application/octet-stream");

header("Content-Disposition: attachment; filename=".basename($file)."");

header("(anti-spam-content-type:) ".$file."");

header("Content-Length: ".filesize($file));

ob_clean();

readfile ($file);

?>

معاينة الكود : http://yaaaaah.com/tg.php